Superheater.



PATENTBD DEC. 5, 1905. 0. D. MOSHER.

'SUPERHBATER. APPLICATION FILE!) JULY 17.1903.

2 SHEETS-SHEET 1,

wysf/im My, OQMM Wc't/ze 4 a uuirnn STATES PATENT OFFICE.

CHARLES D; MOSHER, OF NEW' YORK, N. Y.

SUPE'RHE'ATER.

mfsoaice,

To all whom it may concern.-

Be it known that'I, CHARLES D. MosHER, a;

citizen of the United States, residing at New York, in the county of New York and State of New York, have invented 'certain new and useful. Improvements in Water-Tube-Boiler Superheaters, of which the following is a specibe obtained by the heat from the combustion-' chamber without impairing the generating qualities of the boilers tubes, as will now be set forth in detail.

In the drawings, Figure 1 is a vertical longitudinal section of a boiler supplied with the improvement in superheaters. Fig. 2 is atopv view, partly in section, of portions of the superheating-tubes; Fig. 3, a side elevation of one of the superheating-tubes with the supply and exhaust tubes; and Fig. 4, a top view of the boiler with the upper portion of the casing and the air-supply tubes removed, showing the relative arrangement of the superheaters.

In the construction of my invention I employ the well-known type of water-tube boiler, in which 5 represents the steam-drum, 6 the waterdrum, and 7 the generating-tubes connecting these drums, the tubes being so arranged that they can be withdrawn through the plug-holes on the forward side of the steam-drum. In Fig. 1 I show one of the plugs 8, with dotted lines 9 illustrating the manner in which the tubes are directed toward and drawn out through said holes.

Directly above the generating-tubes and substantially on the same angle are the steamsuperheating tubes, which comprise a transverse tube 10, connected centrally with a pipe 11, which joins a horizontal pipe 12'above the steam-drum 5 by means of a cross connection 13 and from which steam is supplied to the engine. Within the transverse tube 10 is a smaller tube 14, secured in heads 15 in the ends of the tube 10, which inner tube has pipe connections 16 with the ends of the horizontal pipe 12, a valve 17 being placed in one or both of the pipes 16. A valve '18 may also be placed in the horizontal pipe 12 on each side of the connecting-pipe 11, so that the super- Specification of Letters Patent. 7 Application filed July 17,1903. Serial No. 166,064.

.Patented Dec. 5, 1905.

the outer tube 10 has a series of tubes 19 projecting therefrom, the lower end of each tube being provided with a screw-cap 20. The inner tube 14 has smaller tubes 21 secured therein, so thatthey rest within the outer tubes 19, extending down to a point near the caps 20, terminating in open ends. The object of the pipes thus arranged is to form a thin spacearound the inner tube for the steam topass', and as the outer tubes 19 are directly in the path of the escaping gases from thecombustion-chamber the steam will thus be more positively subjected to the heat than if it merely passes through pipes inthe ordinary manner. As the horizontal pipe 12 is connected with the steam-space of the boiler at its ends by the vertical pipes 22, it is obvious that the steam from the boiler will pass up through the pipes 22,-thence through the connections l6 and inner tube 14, and be distributed through the tubes 19, and after pass-- ing up through these'tubes and beingv discharged into the outer tube 10 will pass up into the tube 11 and be conducted to the-engine.- Directly above these superlieating tubes is a plurality of air-tubes 23, having an airinlet24 at their upper ends and a chamber 25.

at their lower ends. This chamber extends along the rear end of the boiler and down around the rear side ofthe water drum 6, connecting with the rear end of the ash-pit 26, a

door 27 being provided at this point, so that the quantity of air supplied may be regulated. Air-holes. 28 are also provided through the rear and side walls of the combustion-chamber with regulating-doors 29, and by means of which all the air to the combustion-chamber may be supplied, as desired, from the rear airchamber. The front wall 30 of the combustion-chamber is made hollow, as at 31, and provided with inlet-holes 32, whereby air may be furnished to the combustion-chamber above the fuel-bed, and regulating-doors 33 are also Inthis instance the suction-fan 38 may be 10- cated forward of the vertical air-tubes 37; but in either case the air is drawn through the system substantially as shown by the darts.

In Fig. 1 the suction-fanrests behind a dividing-wall 39, through which is an aperture 40, and above the fan is a damper 41, hinged to and in line with the wall 39 and adapted to swing in such manner as to close the free ap erture 42 above the air-tubes 23 or channel 43 above the fan.

Where natural draft is employed, the damper is thrown over, closing the channel 43,so the product of combustion will not pass through the fan; but when the fan is used the Elj amper is thrown to the position indicated in With this arrangement and construction of the superheaters I am able to utilize a greater share of the escaping heat than by other forms heretofore employed, and, furthermore, such tubes may be used without enlarging the structure, and they are so located that they can readily be examined or repaired.

What I claim as new is 1. In a steam-generator, a steam and a water drum connected together by a plurality of generating-tubes, in combination with a superheater above said tubes comprising a transverse pipe along the steam-main and connected therewith intermediate its ends, a series of open-ended tubes projecting therefrom rear-. wardly and substantially parallel with thegenerating-tubes below the top casing of the generator a pipe inclosing said transverse pipe also connected with the steam-main, having tubes with closed ends surrounding said open-ended tubes.

2. In a steam-generator an outer pipe centrally connected with the steam-discharge with a plurality of projecting tubes closed at their outer ends, in combination with a head at each end, an inner pipe passing through the heads of the outer pipe and connecting with a steamsupply, and provided with small open-ended tu bes within the aforesaid projecting tubes, as set forth.

3. In a steam-generator the combination of a steam and a water drum connected together by a plurality of generating-tubes, a transverse pipe across the generating-tubes connected with the steam-discharge pipe having a head at each end and a plurality of projecting tubes with closed ends'extending along parallel with the generating tubes, a pipe within the transverse pipe having tubes which rest within the aforesaid projecting tubes, said pipe being secured through the heads of the outer pipe and connected with the steamsupply pipe from the steam-drum, and valves for controlling the supply of steam to said superheater, as set forth.

In testimony whereof I afiix my signature in presence of two witnesses.

CHARLES D. MOSH ER.

Witnesses:

THOMAS W. MORRISON, WILLIAM MoLLoY. 

